A cat-back system probably won't give you many horse (if any at all), but the sound will be much nicer. I would go with the Dynomax. They are nice and throaty, but not too loud.
If you're looking more for a mod for horsepower, you should look at X or H pipes.
Be aware that cat-backs are usually cheaper that the aftermarket X or H pipes.
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98 GT
Dyno-Max cat-back exhaust, 3.73 gears, Steeda shifter, Ford Motorsport Underdrive pullies, 87mm MAF and Roush cold air kit...
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